Road grader level



May 12,1936- L. PERSSON 2,040,708

ROAD GRADER LEVEL Filed May 16, 1955 2 Sheets-Sheet 1 W; rll T IIIlz'izusferas'an 4/ flwaoi iu Attorney Inventor May 12, 1936.

L. PERSSON ROAD GRADER LEVEL Filed May 16, 1935 2 Sheets-Sheet 2Attorney Patented May 12, 1936 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates generally to a level to be, mounted on a roadgraderto continuously and instantly inform the operator of the roadgrader ofthe actual crown on the road, and an impor- 5 tant object of myinvention is to provide a simple and structurally eflicient arrangementof the character indicated which is accurate and dependable and easilyinstalled.

Other important objects of my invention will 10 be apparent from areading of the following description in connection with the drawings,wherein for purposes of illustration I have shown a preferred embodimentof my invention.

In the drawings:---

15 Figure 1 is a transverse vertical sectional view taken through aroadgrader and showing the arrangement of the invention mounted on thedrawbar of the roadgrader.

Figure 2 is a transverse vertical sectional view 20 taken through oneend of the arrangement showing the construction of one of the hydraulicindicators.

Figure 3 is an elevational view taken from the right of Figure 2.

25 Figure 4 is a horizontal sectional View taken through Figure 2approximately on the line 4-4.

Figure 5 is a transverse vertical sectional view taken through Figure 1approximately on the line 5--5.

30 Referring in detail to the drawings, the numerals 5 and 6 refer'tothe arched longitudinal members of the frame of the roadgrader which lieon opposite sides of and are mounted in connection with the drawbarwhich includes the side 35 members I and 8. To the underside of themembers 'l and 8 is mounted the framework 9 from which depend the arms land H to the lower ends of which are connected the brackets l2 and I3which are connected to the rear side of the 40 roadbed engaging elementM.

In accordance with the present invention I mount on and across the upperedges of the grader frame members 7 and 8 the U-shaped frame which isgenerally designated l and which 45 is of angle iron cross section withthe vertical flange arranged forwardly and the remaining flangehorizontally in protecting relation to the correspondingly shaped levelgauge element which is generally designated "3 or I mount the U- shapedframe on the members 5 and 6.

The level gauge element [6 is composed of the relatively small pipe I!which lies on the horizontal part of the frame [5 and connects by areducing elbow H! to the lower end of the larger 55 tube I9 which islocated behind the forward flange of the corresponding vertical end ofthe frame [5 and laterally inwardly of the remaining flange thereof. Theupper end of the tube I9 is closed by a plug 20 in which is screwed abushing 2| through which works the piston rod 5 22 on the lower end ofwhich is a float piston 23. Below the bushing 2| the rod 22 has squaredteeth 24 on its laterally inward side which operatively engage pins 25extending between and connected to spaced disks 26 and 21 which extendthrough an opening 28 in the laterally inward side of the upper part ofthe tube l9 and are rotatably mounted by and on an axle 29 journaled inlug portions 30 and 3|, constituted by enlargements of the tube IS. Thegauge is mounted transversely on the frame bars 18 and intersects thediagonal scraper l4 at approximately its mid point.

The rear end of the axle 29 has fixed thereto the indicator hand 32which cooperates with an indicia equipped disk 33 which is mounted tothe lug 3|.

A roller 34 journaled on a shaft 35 extending diametrically across thetube l9 rolls against the laterally outward smooth side of the rod 22 ina manner to preserve the alignment and easy working characteristics ofthe rod 22 and to hold the teeth 24 against the pins 25. It is obviousthat this arrangement brings the rod 22 in between the disks 26 and 21,so that mutual cooperation exists between the roller 34, the rod 22, theinner sides of the disks 26 and 21, and the pins 25, whereby smooth andnon-wearing action of the parts is assured.

The small pipe I! is provided adjacent its opposite ends with controlvalves 36 and 31, respectively, while the center of the small pipe I!has a riser 38 thereon provided at its upper end with a filling cap 38'enabling introduction of the leveling fluid which operates the floats23. 0

U-bolts 39 and 40 encircle the ends of the small pipe I! and traversethe horizontal flange of the frame l5 for holding the small pipe inplace on the frame. An additional similarly arranged U- bolt 4| iscentrally connected between the frame and the small pipe, while U-shapedbolt clamps 42 and 43 encircle the tubes I 9 for locking the same inplace in the vertical end portions of the frame IS. The floats 23 willbe of any suitable buoyant arrangement or construction and work closelyalthough sufficiently loose within the tubes l9.

It can be seen, that in the event the apparatus tilts downwardly towardthe left in Figure 1, the fluid in the conduit I! will rise in the tubeI9,

Cir

lifting the float 23, which carrying the rack 24 therewith will rotatethe wheel 26 located on the shaft 30 with the pointer 32. The variancein grade will be indicated by comparing the pointer 32 with the dial 33.

Although I have shown and described herein a preferred embodiment of myinvention, it is to be definitely understood that I do not desire tolimit the application of the invention thereto, and any change orchanges may be made in the materials and in the structure andarrangement of the parts, within the spirit of the invention and thescope of the subjoined claim.

What is claimed is:

A level indicator comprising an elongated substantially horizontallydisposed conduit, a fluid in the conduit, upstanding tubular extensionsat the ends of the conduit, a float in each of the extensions, a rackbar extending upwardly from each of the floats, a guide in one end ofeach of the extensions for slidably receiving the rack bar, one sideportion of each of the extensions being provided with an opening, a gearmounted in each opening for mesh with the adjacent rack, each of thesaid gears being provided with an external shaft, a gauge platestationarily secured to the outside of each of the extensions andthrough which the corresponding shaft extends, graduations on the gaugeplate and a pointer secured to the corresponding shaft at the front ofthe said gauge plate.

LINUS PERSSON.

